<?php
/**
 * Admin file import controller.
 *
 * @package WPContentSync
 */

namespace WPContentSync\Admin;

use WPContentSync\Logging\LoggerInterface;
use WPContentSync\Sync\SyncEngine;
use WPContentSync\Transport\FileTransportInterface;

final class FileImportController {
	private FileTransportInterface $transport;
	private LoggerInterface $logger;
	private SyncEngine $sync_engine;

	public function __construct( FileTransportInterface $transport, LoggerInterface $logger, SyncEngine $sync_engine ) {
		$this->transport   = $transport;
		$this->logger      = $logger;
		$this->sync_engine = $sync_engine;
	}

	public function register(): void {
		add_action( 'admin_post_wpcs_import_package', array( $this, 'handleImport' ) );
	}

	public function handleImport(): void {
		if ( ! current_user_can( 'manage_options' ) ) {
			throw new \RuntimeException( 'You do not have permission to import content packages.' );
		}

		if ( ! check_admin_referer( 'wpcs_import_package', 'wpcs_import_package_nonce' ) ) {
			throw new \RuntimeException( 'The import request could not be verified.' );
		}

		if ( ! isset( $_FILES['wpcs_package_file']['tmp_name'], $_FILES['wpcs_package_file']['error'] ) ) {
			throw new \RuntimeException( 'Choose a package JSON file before importing.' );
		}

		if ( UPLOAD_ERR_OK !== (int) $_FILES['wpcs_package_file']['error'] ) {
			throw new \RuntimeException( 'The package file could not be uploaded.' );
		}

		$uploaded_file = sanitize_text_field( (string) $_FILES['wpcs_package_file']['tmp_name'] );

		// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- Reading a validated local upload temp file.
		$contents = file_get_contents( $uploaded_file );

		if ( false === $contents ) {
			throw new \RuntimeException( 'The package file could not be read.' );
		}

		try {
			$package = $this->transport->import( $contents );
		} catch ( \InvalidArgumentException $exception ) {
			$this->logger->warning(
				'Rejected imported content package.',
				array(
					'error' => $exception->getMessage(),
				)
			);

			$this->redirectToDashboard(
				array(
					'wpcs_import_error' => $exception->getMessage(),
				)
			);
			return;
		}

		$result = $this->sync_engine->importPackage( $package );

		if ( ! $result->isSuccessful() ) {
			$this->logger->error(
				'Imported content package failed.',
				$result->toArray()
			);

			$this->redirectToDashboard(
				array(
					'wpcs_import_error' => implode( ' ', $result->errors() ),
				)
			);
			return;
		}

		$this->logger->info( 'Imported content package.', $result->toArray() );

		$this->redirectToDashboard(
			array(
				'wpcs_imported' => '1',
			)
		);
	}

	/**
	 * @param array<string, string> $args Redirect query args.
	 */
	private function redirectToDashboard( array $args ): void {
		wp_safe_redirect(
			add_query_arg(
				$args,
				admin_url( 'admin.php?page=wp-content-sync' )
			)
		);
	}
}